<!-- 装修商品组件：商品卡片 -->
<template>
  <!-- 商品卡片 -->
  <view>
    <!-- 布局1. 单列大图（上图，下内容）-->
    <view v-if="layoutType === LayoutTypeEnum.ONE_COL_BIG_IMG && state.goodsList.length" class="goods-sl-box">
      <view
        v-for="item in state.goodsList"
        :key="item.id"
        class="goods-box"
        :style="[{ marginBottom: data.space * 2 + 'rpx' }]"
      >
        <s-goods-column
          class=""
          size="sl"
          :goods-fields="data.fields"
          :tag-style="data.badge"
          :data="item"
          :title-color="data.fields.name?.color"
          :sub-title-color="data.fields.introduction.color"
          :top-radius="data.borderRadiusTop"
          :bottom-radius="data.borderRadiusBottom"
          @click="sheep.$router.go('/pages/goods/index', { id: item.id })"
        >
          <!-- 购买按钮 -->
          <template #cart>
            <button class="ss-reset-button cart-btn" :style="[buyStyle]">
              {{ btnBuy.type === 'text' ? btnBuy.text : '' }}
            </button>
          </template>
        </s-goods-column>
      </view>
    </view>

    <!-- 布局2. 双列（每一列：上图，下内容）-->
    <view
      v-if="layoutType === LayoutTypeEnum.TWO_COL && state.goodsList.length"
      class="goods-md-wrap ss-flex ss-flex-wrap ss-col-top"
    >
      <view class="goods-list-box">
        <view
          v-for="item in state.leftGoodsList"
          :key="item.id"
          class="left-list"
          :style="[{ paddingRight: data.space + 'rpx', marginBottom: data.space + 'px' }]"
        >
          <s-goods-column
            class="goods-md-box"
            size="md"
            :goods-fields="data.fields"
            :tag-style="data.badge"
            :data="item"
            :title-color="data.fields.name?.color"
            :sub-title-color="data.fields.introduction.color"
            :top-radius="data.borderRadiusTop"
            :bottom-radius="data.borderRadiusBottom"
            :title-width="330 - marginLeft - marginRight"
            @click="sheep.$router.go('/pages/goods/index', { id: item.id })"
            @getHeight="calculateGoodsColumn($event, 'left')"
          >
            <!-- 购买按钮 -->
            <template #cart>
              <button class="ss-reset-button cart-btn" :style="[buyStyle]">
                {{ btnBuy.type === 'text' ? btnBuy.text : '' }}
              </button>
            </template>
          </s-goods-column>
        </view>
      </view>
      <view class="goods-list-box">
        <view
          v-for="item in state.rightGoodsList"
          :key="item.id"
          class="right-list"
          :style="[{ paddingLeft: data.space + 'rpx', marginBottom: data.space + 'px' }]"
        >
          <s-goods-column
            class="goods-md-box"
            size="md"
            :goods-fields="data.fields"
            :tag-style="data.badge"
            :data="item"
            :title-color="data.fields.name?.color"
            :sub-title-color="data.fields.introduction.color"
            :top-radius="data.borderRadiusTop"
            :bottom-radius="data.borderRadiusBottom"
            :title-width="330 - marginLeft - marginRight"
            @click="sheep.$router.go('/pages/goods/index', { id: item.id })"
            @getHeight="calculateGoodsColumn($event, 'right')"
          >
            <!-- 购买按钮 -->
            <template #cart>
              <button class="ss-reset-button cart-btn" :style="[buyStyle]">
                {{ btnBuy.type === 'text' ? btnBuy.text : '' }}
              </button>
            </template>
          </s-goods-column>
        </view>
      </view>
    </view>

    <!-- 布局3. 单列小图（左图，右内容） -->
    <view v-if="layoutType === LayoutTypeEnum.ONE_COL_SMALL_IMG && state.goodsList.length" class="goods-lg-box">
      <view
        v-for="item in state.goodsList"
        :key="item.id"
        class="goods-box"
        :style="[{ marginBottom: data.space + 'px' }]"
      >
        <s-goods-column
          class="goods-card"
          size="lg"
          :goods-fields="data.fields"
          :data="item"
          :tag-style="data.badge"
          :title-color="data.fields.name?.color"
          :sub-title-color="data.fields.introduction.color"
          :top-radius="data.borderRadiusTop"
          :bottom-radius="data.borderRadiusBottom"
          @tap="sheep.$router.go('/pages/goods/index', { id: item.id })"
        >
          <!-- 购买按钮 -->
          <template #cart>
            <button class="ss-reset-button cart-btn" :style="[buyStyle]">
              {{ btnBuy.type === 'text' ? btnBuy.text : '' }}
            </button>
          </template>
        </s-goods-column>
      </view>
    </view>
  </view>
</template>

<script setup>
/**
 * 商品卡片
 */
import { computed, reactive, onMounted } from 'vue'
import sheep from '@/sheep'
import SpuApi from '@/api/product/spu'

// 布局类型
const LayoutTypeEnum = {
  // 单列大图
  ONE_COL_BIG_IMG: 'oneColBigImg',
  // 双列
  TWO_COL: 'twoCol',
  // 单列小图
  ONE_COL_SMALL_IMG: 'oneColSmallImg',
}

const state = reactive({
  goodsList: [],
  leftGoodsList: [],
  rightGoodsList: [],
})
const props = defineProps({
  data: {
    type: Object,
    default() {},
  },
  styles: {
    type: Object,
    default() {},
  },
})

const { layoutType, btnBuy, spuIds } = props.data ?? {}
const { marginLeft, marginRight } = props.styles ?? {}

// 购买按钮样式
const buyStyle = computed(() => {
  if (btnBuy.type === 'text') {
    // 文字按钮：线性渐变背景颜色
    return {
      background: `linear-gradient(to right, ${btnBuy.bgBeginColor}, ${btnBuy.bgEndColor})`,
    }
  }
  if (btnBuy.type === 'img') {
    // 图片按钮
    return {
      width: '54rpx',
      height: '54rpx',
      background: `url(${sheep.$url.cdn(btnBuy.imgUrl)}) no-repeat`,
      backgroundSize: '100% 100%',
    }
  }
})

//region 商品瀑布流布局
// 下一个要处理的商品索引
let count = 0
// 左列的高度
let leftHeight = 0
// 右列的高度
let rightHeight = 0

/**
 * 计算商品在左列还是右列
 * @param height 商品的高度
 * @param where 添加到哪一列
 */
function calculateGoodsColumn(height = 0, where = 'left') {
  // 处理完
  if (!state.goodsList[count]) return
  // 增加列的高度
  if (where === 'left') leftHeight += height
  if (where === 'right') rightHeight += height
  // 添加到矮的一列
  if (leftHeight <= rightHeight) {
    state.leftGoodsList.push(state.goodsList[count])
  } else {
    state.rightGoodsList.push(state.goodsList[count])
  }
  // 计数
  count++
}
//endregion

/**
 * 根据商品编号列表，获取商品列表
 * @param ids 商品编号列表
 * @return {Promise<undefined>} 商品列表
 */
async function getGoodsListByIds(ids) {
  const { data } = await SpuApi.getSpuListByIds(ids)
  return data
}

// 初始化
onMounted(async () => {
  // 加载商品列表
  state.goodsList = await getGoodsListByIds(spuIds.join(','))
  // 只有双列布局时需要
  if (layoutType === LayoutTypeEnum.TWO_COL) {
    // 分列
    calculateGoodsColumn()
  }
})
</script>

<style lang="scss" scoped>
.goods-md-wrap {
  width: 100%;
}

.goods-list-box {
  width: 50%;
  box-sizing: border-box;
  .left-list {
    &:nth-last-child(1) {
      margin-bottom: 0 !important;
    }
  }
  .right-list {
    &:nth-last-child(1) {
      margin-bottom: 0 !important;
    }
  }
}

.goods-box {
  &:nth-last-of-type(1) {
    margin-bottom: 0 !important;
  }
}

.goods-md-box,
.goods-sl-box,
.goods-lg-box {
  position: relative;

  .cart-btn {
    position: absolute;
    bottom: 18rpx;
    right: 20rpx;
    z-index: 11;
    height: 50rpx;
    line-height: 50rpx;
    padding: 0 20rpx;
    border-radius: 25rpx;
    font-size: 24rpx;
    color: #fff;
  }
}
</style>
